H - Electricity – 03 – K
Patent
H - Electricity
03
K
328/125
H03K 19/013 (2006.01) H03K 5/08 (2006.01) H03K 19/018 (2006.01)
Patent
CA 1289630
METHOD AND APPARATUS FOR COUPLING AN ECL OUTPUT SIGNAL USING A CLAMPED CAPACITIVE BOOTSTRAP CIRCUIT ABSTRACT A method and apparatus for providing ECL output signals to a capacitative load includes differential amplification of input signals with a first output of a differential amplifier connected for establishing a voltage level between voltage limits Vcc and Vee at the output of an output driver in response to variations in the first amplifier output. A pull-down transistor has a collector connected to the output driver output, an emitter connected to the Vee voltage source, and a base coupled through a boost capacitor to the second amplifier output. A voltage clamp embracing a clamp transistor with a base connected to receive a predetermined control voltage has an emitter connected to the boost capacitor and the pull-down transistor base and a collector connected to the Vcc voltage source. The clamp transistor is operated in Darlington configuration to provide a minimum discharge impedence to the base of the pull-down transistor. A recovery capacitor is connected between the clamp transister base and the first amplifier output to speed up the clamp transistor's operation.
583206
Coy Bruce Harrison
Rosky David Scott
Applied Micro Circuits Corporation
Smart & Biggar
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